Anse Trabaud Swell Statistics, Autumn: Surf with Light or Offshore Winds
This image shows only the swells directed at Anse Trabaud that coincided with light winds or offshore conditions through a typical northern hemisphere autumn and is based upon 7252 predictions, one every 3 hours. The direction of the spokes show where quality surf generating swell comes from. Five colours illustrate increasing wave sizes. Blue shows the smallest swells, less that 0.5m (1.5 feet) high. Green and yellow represent increasing swell sizes and red represents the largest swells, greater than >3m (>10ft). In each graph, the area of any colour is proportional to how frequently that size swell happens.
The diagram suggests that the dominant swell direction, shown by the longest spokes, was E (which was the same as the most common wind direction). The chart at the bottom shows the same thing but without direction information. For example, swells larger than 1.5 feet (0.5m) coincided with good wind conditions 0.4% of the time, equivalent to 0 days. Open sea swells exceeding >3m (>10ft) are unlikely to arise in a normal northern hemisphere autumn. Taking into account the fraction of these swells that coincided with expected offshore winds, and given the fact that Anse Trabaud is slightly protected from open water swells, we estimate that clean surf can be found at Anse Trabaud about 0.4% of the time and that surf is spoilt by onshore wind 36% of the time. This is means that we expect 33 days with waves in a typical northern hemisphere autumn, of which 0 days should be clean enough to surf.
IMPORTANT: Beta version feature! Swell heights are open water values from NWW3. There is no attempt to model near-shore effects. Coastal wave heights will generally be less, especially if the break does not have unobstructed exposure to the open ocean.